Patterson was found about 3:20 a.m. Saturday near Marina Way South and Ohio Avenue, suffering from fatal gunshot wounds.

Three blocks east at 17th Street and Ohio Avenue, police found Walker slumped behind the wheel of a sedan, also suffering from several gunshot wounds that proved fatal.

Police did not disclose a motive for the homicides.

Rowl is being held at Contra Costa County Jail in Martinez in lieu of $4.45 million bail on suspicion of two counts of murder, two counts of discharging a firearm, four counts of personal use of a firearm and two counts of committing a felony while out on bail.